After macroscopic and microscopic analysis, the type of the fracture belongs to brittle fracture is confirmed. Insufficient tempering is the main factor and the improper grinding is the outer factor.

• 通过宏观和微观分析,证实模板的断裂属脆性断裂,导致模板断裂的主要原因是热处理时回火不足,模板磨削不当是断裂的外部原因。